This is just what I like to use when I unlock everything(I am not 65 on my prestige yet).
Weapon: Either
Thompson Sub Machine Gun with either
Silencer or
Bigger Magazine(I cannot remember the name

) or
STG-44 with a
Flash Hider
Side-Arm: Magnum
Perk 1: Bomb Squad or
Bandolier
Perk 2: Camouflage or
Sleight of Hand
Perk 3: Dead Silence or
Second Chance